Date: Wed, 11 May 2005 17:24:41 -0400 (EDT) From: "Mike Jakubik" <mikej@rogers.com> To: "Kris Kennaway" <kris@obsecurity.org> Cc: Marian Durkovic <md@bts.sk> Subject: Re: SOLVED: Degraded TCP performace on Intel PRO/1000 Message-ID: <1318.172.16.0.199.1115846681.squirrel@172.16.0.1> In-Reply-To: <20050507043712.GB28373@xor.obsecurity.org> References: <20050505133250.GA73885@us.svf.stuba.sk> <20050506065950.GA1999@us.svf.stuba.sk> <20050507043712.GB28373@xor.obsecurity.org>
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On Sat, May 7, 2005 12:37 am, Kris Kennaway said: > On Fri, May 06, 2005 at 08:59:50AM +0200, Marian Durkovic wrote: > >> Hi all, >> >> >> >> seems we've found the problem. The performance degradation was >> happening it the TX path, due to insufficient setting of TX packet >> buffer FIFO on the chip. >> >> To achieve wirespeed performance, the TX FIFO must be large enough to >> accomodate 2 jumbo packets (not just 1 as the driver was assuming). There >> was also a typo in the driver, causing the PBA tuning on most cards to >> be non-functional. >> >> Due to above limitation, the 82547 chipset (featuring only 40 KB of >> RX/TX FIFO) only supports wirespeed tranfers upto 8 KB TCP payload >> (MTU 9000 bytes). >> >> >> Please be sure to use em driver version 1.7.41 or newer, either from >> the CVS (branch RELENG_4_11) or from Intel's downloads. > > Does this also apply to 5.x and above? If no-one else responds in the > next few days, can you please submit the patch in PR so it does not get > lost? > > Kris Any luck submitting the patch for this? I looked at Intels website, and the latest drive for FreeBSD 4.7 is 1.7.35. Which is what is also used on -CURRENT now. They also state "Development is no longer taking place on this driver. For the latest development driver for FreeBSD* 5.3 or above, please download em-2.0.5.a.tar.gz." However there is no link provided for this driver. Am i just looking in the wrong place? Thanks.
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